Home renovator finds $100k Superman comic

A home owner gutting his old derelict property has stumbled upon a vintage Superman comic worth more than $100,000.

The 1938 Action Comics #1 comic, featuring a new character named Superman lifting a car over his head, was found hidden in old newspapers used to insulate one of the walls of David Gonzalez's house in the US state of Minnesota.

"I knew it was worth money, but I had no idea how much," the 34-year-old told the Minneapolis Star Tribune.

Mr Gonzalez, who has worked in construction and home remodelling for a decade, said he always dreamed of finding hidden treasures in demolition work and sometimes put dollar bills in new walls for people to find years later.

The comic has attracted more than 30 bids in an online auction so far, including one for AUD$110,760.

But the find could have been worth even more if it had not been slightly torn in an argument with one of Mr Gonzalez's in-laws.

His wife's aunt reportedly excitedly grabbed the comic and when Mr Gonzalez took it back the back cover tore.